1

Possible allergy:
Showers are a common place for mold growth, spend some time cleaning the bath with anti-mold bathroom cleansers and don't forget the shower curtain. If your symptoms persist, it is probably not mold allergy.
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2

Probably:
To get a sure answer, consult an allergist, they can test you to find out. Floating dust can also be an irritant and cause people to sneeze without being allergic to it, but if the dust is settlled, and you are still sneezing, you may be allergic to it.
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5

Could b allergies.:
This would suggest that you are allergic at least to something in or around the home. Pets? Dust mites? Mold in a central AC or heating system? If you tend to sneeze only when at home and not outside the home, it does argue towards an allergy to something in the home.
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6

Allergies change:
Adults change their allergies on average every seven years. Just because you have been allergic to something does not mean that you always will be, and new allergies can happen.
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7

Sexual sneezing:
Has been reported since at least 1897. This may be related to the changes in blood flow that occur with sexual arousal (it goes to your nose as well as elsewhere) rather than being "allergic" to sex. It might help to use a steroid nasal spray or decongestant prior to sex. Good luck! one medical article about this is at:
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8

Very much possible:
if that is really bothersome try to avoid exposure to cats as much as you can, if you can't or symptoms get worse check with an allergist/immunologist, for evaluation and a? Allergy testing, look at aaaai.org or acaai.org for an allergist in your area
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9

Sneezing and rain:
While some people associate rain-related symptoms with mold, the more likely triggers are probably non-specific factors having little to do with allergy, such as changes in atmospheric pressure, increased levels of irritants like ozone, and increased humidity/water vapor in the air.
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10

Not an allergy:
This is a common reaction to exercise known as vasomotor rhinitis. Some people get non-allergic runny nose due to overactive mucosal tissue in their nose. Common triggers include exercise, rapid temperature swings (e.g. Going from outdoors into an air conditioned room), or eating. Nasal antihistamine sprays can be helpful for some patients with this problem.
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